/*
 * $Id:  $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2012 1T3XT BVBA
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */

using System;
using System.Reflection;

namespace iTextSharp.text {

    /**
     * This class contains version information about iText.
     * DO NOT CHANGE THE VERSION INFORMATION WITHOUT PERMISSION OF THE COPYRIGHT HOLDERS OF ITEXT.
     * Changing the version makes it extremely difficult to debug an application.
     * Also, the nature of open source software is that you honor the copyright of the original creators of the software.
     */
    public sealed class Version {

	    // membervariables
	    /**
	     * This String contains the name of the product.
	     * iText is a registered trademark by 1T3XT.
	     * Please don't change this constant.
	     */
	    static private String iText = "iTextSharp\u2122";
    	
	    /**
	     * This String contains the version number of this iText release.
	     * For debugging purposes, we request you NOT to change this constant.
	     */
        static private String release = "5.4.3";

        /**
         * The license key.
         */
        private String key = null;

	    /**
	     * This String contains the iText version as shown in the producer line.
	     * iText is a product developed by 1T3XT BVBA.
	     * 1T3XT requests that you retain the iText producer line
	     * in every PDF that is created or manipulated using iText.
	     */
	    private String iTextVersion = iText + " " + release + " \u00a92000-2013 1T3XT BVBA";

	    /** The iText version instance. */
	    private static Version version = null;
    	
	    /**
	     * Gets an instance of the iText version that is currently used.
	     * Note that 1T3XT requests that you retain the iText producer line
	     * in every PDF that is created or manipulated using iText.
	     */
	    public static Version GetInstance() {
		    if (version == null) {
			    version = new Version();
			    try {
                    Type type = Type.GetType("iTextSharp.license.LicenseKey, itextsharp.LicenseKey");
                    MethodInfo m = type.GetMethod("GetLicenseeInfo");
                    String[] info = (String[])m.Invoke(Activator.CreateInstance(type), null);
                    if (info[3] != null && info[3].Trim().Length > 0)
                    {
                        version.key = info[3];
                    }
                    else
                    {
                        version.key = "Trial version ";
                        if (info[5] == null)
                        {
                            version.key += "unauthorised";
                        }
                        else
                        {
                            version.key += info[5];
                        }
                    }
                    if (info[4] != null && info[4].Trim().Length > 0)
                    {
                        version.iTextVersion = info[4];
                    }
                    else if (info[2] != null && info[2].Trim().Length > 0)
                    {
                        version.iTextVersion += " (" + info[2];
                        if (!version.key.ToLower().StartsWith("trial"))
                        {
                            version.iTextVersion += "; licensed version)";
                        }
                        else
                        {
                            version.iTextVersion += "; " + version.key + ")";
                        }
                    }
                    // fall back to contact name, if company name is unavailable
                    else if (info[0] != null && info[0].Trim().Length > 0)
                    {
                        version.iTextVersion += " (" + info[0];
                        if (!version.key.ToLower().StartsWith("trial"))
                        {
                            // we shouldn't have a licensed version without company name,
                            // but let's account for it anyway
                            version.iTextVersion += "; licensed version)";
                        }
                        else
                        {
                            version.iTextVersion += "; " + version.key + ")";
                        }
                    }
                    else
                    {
                        throw new Exception();
                    }

			    } catch (Exception) {
				    version.iTextVersion += " (AGPL-version)";
			    }
		    }
		    return version;
	    }
    	
	    /**
	     * Gets the product name.
	     * 1T3XT requests that you retain the iText producer line
	     * in every PDF that is created or manipulated using iText.
         * @return the product name
         */
        public String Product {
            get {
                return iText;
            }
        }
        
	    /**
	     * Gets the release number.
	     * 1T3XT requests that you retain the iText producer line
	     * in every PDF that is created or manipulated using iText.
         * @return the release number
         */
        public String Release {
            get {
                return release;
            }
        }

	    /**
	     * Returns the iText version as shown in the producer line.
	     * iText is a product developed by 1T3XT BVBA.
	     * 1T3XT requests that you retain the iText producer line
	     * in every PDF that is created or manipulated using iText.
         * @return iText version
         */
        public String GetVersion {
            get {
                return iTextVersion;
            }
        }

        /**
        * Returns a license key if one was provided, or null if not.
        * @return a license key.
        */
        public String Key {
            get {
                return key;
            }
        }

    }
}
